Vocal fold injection is used to treat unilateral vocal fold paralysis by injecting material into the paralyzed vocal fold. This pushes the paralyzed fold to the middle so that when the normal fold closes there is no gap. For this procedure the patient is put to sleep with a general anesthetic and a special scope is put into the throat so that the injection can be performed. There are several things that can be used for vocal fold injections, these include patient's own fat or synthetic materials. Some injections can be performed with local anesthesia.